DC-Transformer 251E-28-SD

Converter can be used in various applications

Key figures

  • ultrawide input voltage range: 16 ... 36 VDC
  • very high efficiency: up to 97%
  • peak input voltage: 37 VDC
  • output voltage / max. output current: 28.0 VDC / 11.0 ADC


Buck-Boost DC-DC converter with internal decoupling diode, suitable as a charging converter and optimized parallel connection. It is recommended to use its successor part 257E-28-SD for new designs. Output voltages up to 48V can be realized with the new generation dc-dc power supply. Contact us at any time for more information on this DC-input battery charger.


  • non-isolated step up and step down converter
  • very low input ripple
  • continous no load and short circuit proof
  • for ambient temperatures of -40°C up to +85°C
  • thermal shutdown at +90°C
  • for active loads, can be connected in parallel
  • integrated EMI input and output filter
  • no derating of power
  • heatsinking metal plate
  • robust design
  • unipolar output voltage
  • non-isolated output